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(FILES) In this December 30, 2014 file photo, a McDonalds fast food restaurant is seen in Alexandria, Virginia . Fast-food giant McDonald's announced March 4, 2015 it would stop serving chicken raised with antibiotics that are important to human health, as worries grow over resistance to crucial drugs. McDonald's said it would work with poultry farmers to halt the use of what the World Health Organization has identified as "critically important antimicrobials" to feed the chickens it serves alongside its popular hamburgers. Some antibiotics would still be allowed, but only poultry-specific ones not used on people. AFP PHOTO / SAUL LOEB / FILESSAUL LOEB/AFP/Getty Images